Black Annealed Square Tubes
Products Description
Black Annealed Square Tubes are mild steel square hollow sections that have undergone controlled annealing to achieve optimal ductility and workability while maintaining structural integrity. With their distinctive black oxide surface finish, these tubes offer excellent weldability, bendability, and machinability for a wide range of industrial, construction, and fabrication applications.
Products Specification
| Parameter | Specification |
|---|---|
| Material | Q195, Q215, Q235, S235JR (Mild Steel) |
| Standard | ASTM A500, EN 10219, JIS G3466, GB/T 6728 |
| Size Range | 10×10mm – 200×200mm |
| Wall Thickness | 0.8mm – 8.0mm |
| Length | 3m, 6m standard (custom lengths 1-12m available) |
| Surface | Black annealing oxide (Fe₃O₄ layer) |
| Tolerance | ±0.3mm width/thickness, ±1.5mm length |
Key Advantages
Excellent Formability – Easy to bend, weld, and machine
Superior Weldability – Clean, strong welds without special preparation
Cost-Effective – More economical than cold-rolled alternatives
Ready for Finishing – Black oxide surface accepts paint/powder coating well
Consistent Quality – Controlled annealing ensures uniform properties
Products Applications
Construction & Architecture
Interior Framing: Partition walls, ceiling grids, display structures
Handrail Systems: Staircases, balconies, safety barriers
Window/Door Frames: Reinforcement and framework
Exhibition Stands: Modular display systems
Furniture & Interior Design
Furniture Frames: Tables, chairs, shelving units
Retail Fixtures: Display racks, merchandise holders
Decorative Elements: Room dividers, lighting frames
Custom Fabrications: Designer furniture components
FAQ
Q: What is the main advantage of black annealed tubes?
A: Superior workability and formability compared to non-annealed tubes, making them ideal for fabrication and bending applications.
Q: Can these tubes be used outdoors?
A: For short-term outdoor use (3-6 months), yes. For permanent outdoor applications, they require protective painting or powder coating.
Q: How does black annealed differ from ERW square tube?
A: Black annealed undergoes additional heat treatment (annealing) which softens the material, improves ductility, and creates the black oxide surface.
Q: Are your tubes suitable for structural applications?
A: Yes, when properly specified. Our Q235 and S235JR grades meet structural requirements for many applications.
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